In this question, a number series is given with one term missing. Choose the correct option that will continue the same pattern.
17, 19, 15, 23, 7, 39, ?

The given series is like:

$$19=17+2^1$$

$$15=19-2^2$$

$$23=15+2^3$$

$$7=23-2^4$$

$$39=7+2^5$$

So, the next number will be $$39-2^6=39-64=-25$$

So, option B is the correct answer.

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In this question, a number series is given with one term missing. Choose the correct option that will continue the same pattern.17, 19, 15, 23, 7, 39, ?